<div class="header">
    <div class="grid">
        SOHO数据展示
    </div>
</div>
<div class="navigator grid">
    <a href="pm.html" class="active">
        PM2.5
    </a>
    <a href="pm.html" class="">
        温湿度
    </a>
    <a href="pm.html" class="">
        工位检测
    </a>
</div>